| 摘要 |
FIELD: sea-going vessels. SUBSTANCE: propeller blade has suction and driving surfaces which form unsymmetrical contour and profile of blade section with convex-concave center line. Leading edge is concave. Convex section of profile center line is directed towards blade suction surface and concave section of center line is directed towards driving surface of propeller. In maneuvering of ship, zone of maximum stresses of blade is shifted to its leading edge closer to center of blade rigidity, thus reducing stress of blade and enhancing its reliability. Propulsive characteristics are improved by 3 to 5 percent. Besides that, thickness of blade may be reduced at its strength retained. EFFECT: reduction of blade stress, especially in maneuvering of ship. 1 dwg |
